I don't mind spiders, I admire their grace sometimes.
But with me.. I cannot
stand moths, or any form of mollusc. If I am in the same room as one, I will freeze, go all clammy and tense and either beg someone to get rid of it or run away away from it.
I hate slimy things which makes sense with the molluscs, and for moths.. when I was younger I found a moth larva on my bed and it terrified the living crap out of me.
I'm like the least squeamish person you could meet, but those two kinds of bugs creep me out incredibly!